13644535452991 has 2 divisors, whose sum is σ = 13644535452992. Its totient is φ = 13644535452990.

The previous prime is 13644535452931. The next prime is 13644535452997. The reversal of 13644535452991 is 19925453544631.

It is a strong prime.

It is a cyclic number.

It is not a de Polignac number, because 13644535452991 - 2¹¹ = 13644535450943 is a prime.

It is a congruent number.

It is not a weakly prime, because it can be changed into another prime (13644535452997) by changing a digit.

It is a polite number, since it can be written as a sum of consecutive naturals, namely, 6822267726495 + 6822267726496.

It is an arithmetic number, because the mean of its divisors is an integer number (6822267726496).

Almost surely, 2^{13644535452991} is an apocalyptic number.

13644535452991 is a deficient number, since it is larger than the sum of its proper divisors (1).

13644535452991 is an equidigital number, since it uses as much as digits as its factorization.

13644535452991 is an evil number, because the sum of its binary digits is even.

The product of its digits is 69984000, while the sum is 61.

The spelling of 13644535452991 in words is "thirteen trillion, six hundred forty-four billion, five hundred thirty-five million, four hundred fifty-two thousand, nine hundred ninety-one".